249 
Geological Relations of the East of Treland. 
this coast bears all the marks of the agglutinated detritus of a 
primary country ; consisting of rounded and angular fragments of 
granite, mica slate, clay slate, quartz, quartz rock, greywacke, grey- 
wacke slate, flinty slate, and hornstone, cemented by iron-shot sandy 
clay, with scales of mica. This rock at times presents a finer grain, 
and acquires the character of sandstone. The conglomerate some- 
times forms a thick and apparently unstratified mass resting on the 
finer stratified sandstone; and sometimes it is interstratified with 
the latter, as well as with very fine grained reddish brown mica- 
ceous sandstone, which is of a very perishable nature. There is 
no determinate order in this respect, and certain strata or beds only 
yield such excellent blocks of building stone as are used in Dun- 
more Pier, by Mr. Nimmo, the engineer employed by Government 
in planning and constructing this new harbour. In parts of this 
coast, the sea has wrought out spacious caverns in the more perish- 
able sandstone, one of which, Bishop’s hole, extends inland about 
300 yards, and another, Black hole, about 500 yards. 
§ 146. From Dunmore, we perceive, even with the naked eye, 
that the base of the opposite coast in the county of Wexford con- 
sists principally of clay slate, in strata nearly vertical ; but on reach- 
ing this coast, it appears surmounted by a cap of sandstone in 
Broomhill, which corresponds nearly with Knockaveelish head on 
the opposite side. A similar cap occurs more south in Temple- 
town hill, which gradually declines toward the parallel of Loftus 
Hall, where it underlies the tongue of floetz limestone, which ex- 
tends to the extremity of Hook Point. This limestone is arranged 
in very thin strata, of a few inches in thickness, dipping at an angle 
of 4° to 8° toward the south. It contains numerous bivalves and 
corallites. Its connexion with the sandstone is best seen on the 
eastern coast. Proceeding along this coast to the north, the lime- 
V ox.. V. 2 i 
